Prediction of ductile fracture in metal blanking

This study is focused on the description of ductile fracture initiation, wh ich is needed to predict product shapes in the blanking process. Two approa ches are elaborated using a local ductile fracture model, According to lite rature, characterization of such a model should rake place under loading co nditions, comparable to the application. Therefore, the first approach inco rporates the characterization of a ductile fracture model in a blanking exp eriment. The second approach is more favorable for industry. In this approa ch a tensile test is used to characterize the fracture model. instead of a complex and elaborate blanking experiment. Finite element simulations and b lanking experiments are performed for five different clearances to validate both approaches. In conclusion it can be stared that for the investigated material, the first approach gives very Road results within the experimenta l error. The second approach, the more favorable one for industry, yields r esults within 6 percent of the experiments over a wide, industrial range of clearances, when a newly proposed criterion is used [S1087-1357(00)02202-4 ].